Articolo in rivista, 2011, ENG, 10.1088/0953-4075/44/7/075503

Dissipative effects on a generation scheme of a W state in an array of coupled Josephson junctions

Migliore R, Scala M, Napoli A, Yuasa K, Nakazato H, Messina A

Institute of Biophysics, National Research Council, via Ugo La Malfa 153, 90146 Palermo, Italy; Dipartimento di Fisica dell'Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy; Waseda Institute for Advanced Study, Waseda University, Tokyo 169-8050, Japan; Department of Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555, Japan

The dynamics of an open quantum system, consisting of three superconducting qubits interacting with independent reservoirs, is investigated to elucidate the effects of the environment on a unitary generation scheme of W states (Migliore R et al 2006 Phys. Rev. B 74 104503). To this end a microscopic master equation is constructed and its exact resolution predicts the generation of a Werner-like state instead of the W state. A comparison between our model and a more intuitive phenomenological model is also considered, in order to find the limits of the latter approach in the case of structured reservoirs

Journal of physics. B, Atomic molecular and optical physics (Print) 44 (7), pp. 075503–?

Keywords

CNR authors

Migliore Rosanna

CNR institutes

IBF – Istituto di biofisica